"emitted in every translation unit">,
InGroup<DiagGroup<"weak-vtables">>, DefaultIgnore;
+def ext_using_undefined_std : ExtWarn<
+ "using directive refers to implicitly-defined namespace 'std'">;
+
// C++ exception specifications
def err_exception_spec_in_typedef : Error<
"exception specifications are not allowed in typedefs">;
"cannot find protocol declaration for %0; did you mean %1?">;
def note_base_class_specified_here : Note<
"base class %0 specified here">;
+def err_using_directive_suggest : Error<
+ "no namespace named %0; did you mean %1?">;
+def err_using_directive_member_suggest : Error<
+ "no namespace named %0 in %1; did you mean %2?">;
+def note_namespace_defined_here : Note<"namespace %0 defined here">;
} // end of sema category
} // end of sema component.
AttributeList *AttrList);
virtual void ActOnFinishNamespaceDef(DeclPtrTy Dcl, SourceLocation RBrace);
+ NamespaceDecl *getStdNamespace();
virtual DeclPtrTy ActOnUsingDirective(Scope *CurScope,
SourceLocation UsingLoc,
SourceLocation NamespcLoc,
PopDeclContext();
}
+/// \brief Retrieve the special "std" namespace, which may require us to
+/// implicitly define the namespace.
+NamespaceDecl *Sema::getStdNamespace() {
+ if (!StdNamespace) {
+ // The "std" namespace has not yet been defined, so build one implicitly.
+ StdNamespace = NamespaceDecl::Create(Context,
+ Context.getTranslationUnitDecl(),
+ SourceLocation(),
+ &PP.getIdentifierTable().get("std"));
+ StdNamespace->setImplicit(true);
+ }
+
+ return StdNamespace;
+}
+
Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S,
SourceLocation UsingLoc,
SourceLocation NamespcLoc,
assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.");
UsingDirectiveDecl *UDir = 0;
-
+ NestedNameSpecifier *Qualifier = 0;
+ if (SS.isSet())
+ Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
+
// Lookup namespace name.
LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName);
LookupParsedName(R, S, &SS);
if (R.isAmbiguous())
return DeclPtrTy();
+ if (R.empty()) {
+ // Allow "using namespace std;" or "using namespace ::std;" even if
+ // "std" hasn't been defined yet, for GCC compatibility.
+ if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) &&
+ NamespcName->isStr("std")) {
+ Diag(IdentLoc, diag::ext_using_undefined_std);
+ R.addDecl(getStdNamespace());
+ R.resolveKind();
+ }
+ // Otherwise, attempt typo correction.
+ else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false,
+ CTC_NoKeywords, 0)) {
+ if (R.getAsSingle<NamespaceDecl>() ||
+ R.getAsSingle<NamespaceAliasDecl>()) {
+ if (DeclContext *DC = computeDeclContext(SS, false))
+ Diag(IdentLoc, diag::err_using_directive_member_suggest)
+ << NamespcName << DC << Corrected << SS.getRange()
+ << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString());
+ else
+ Diag(IdentLoc, diag::err_using_directive_suggest)
+ << NamespcName << Corrected
+ << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString());
+ Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here)
+ << Corrected;
+
+ NamespcName = Corrected.getAsIdentifierInfo();
+ }
+ }
+ }
+
if (!R.empty()) {
NamedDecl *Named = R.getFoundDecl();
assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named))
// "std" or "bad_alloc" as necessary to form the exception specification.
// However, we do not make these implicit declarations visible to name
// lookup.
- if (!StdNamespace) {
- // The "std" namespace has not yet been defined, so build one implicitly.
- StdNamespace = NamespaceDecl::Create(Context,
- Context.getTranslationUnitDecl(),
- SourceLocation(),
- &PP.getIdentifierTable().get("std"));
- StdNamespace->setImplicit(true);
- }
-
if (!StdBadAlloc) {
// The "std::bad_alloc" class has not yet been declared, so build it
// implicitly.
StdBadAlloc = CXXRecordDecl::Create(Context, TTK_Class,
- StdNamespace,
+ getStdNamespace(),
SourceLocation(),
&PP.getIdentifierTable().get("bad_alloc"),
SourceLocation(), 0);
typedef basic_string<char> string; // expected-note 2{{'string' declared here}}
}
-namespace otherstd { // expected-note 2{{'otherstd' declared here}}
+namespace otherstd { // expected-note 2{{'otherstd' declared here}} \
+ // expected-note{{namespace 'otherstd' defined here}}
using namespace std;
}
return radious * pi; // expected-error{{did you mean 'radius'?}}
}
+using namespace othestd; // expected-error{{no namespace named 'othestd'; did you mean 'otherstd'?}}
+namespace blargh = otherstd; // expected-note{{namespace 'blargh' defined here}}
+using namespace ::blarg; // expected-error{{no namespace named 'blarg' in the global namespace; did you mean 'blargh'?}}
+
bool test_string(std::string s) {
basc_string<char> b1; // expected-error{{no template named 'basc_string'; did you mean 'basic_string'?}}
std::basic_sting<char> b2; // expected-error{{no template named 'basic_sting' in namespace 'std'; did you mean 'basic_string'?}}
}
void f4() { f2(1); }
+
+// PR7517
+using namespace std; // expected-warning{{using directive refers to implicitly-defined namespace 'std'}}
+using namespace ::std; // expected-warning{{using directive refers to implicitly-defined namespace 'std'}}
+